Yalantis/uCrop

Improve Output Image Quality

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#384 opened on Feb 5, 2018

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 (7 comments) (0 reactions) (0 assignees)Java (11,748 stars) (2,134 forks)batch import
help wanted

Description

After Processing Crop & rotate, Image output quality got very poor despite of choosing lossless compression (PNG).

We'r looking to use for documents, it's look unfair to read after crop the document.

Even we didn't crop / rotate, we just pass the image into UCrop but the output has been very poor.

Kindly looking for an awesome output from you.

Note: Output file size doesn't matter upto 2MB

Contributor guide

Tech stack
javaandroid
Domain
mobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Basic Android developmentFamiliarity with Bitmap classUnderstanding of image compression formats
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Investigate the image saving process in uCrop, specifically the compression settings applied after crop and rotate. Look at the Bitmap.CompressFormat and quality parameters used in the output. Check if the library uses a fixed quality value for PNG despite lossless request. Explore files like UCropActivity.java or CropImageView.java where bitmap saving occurs. Ensure that when PNG format is chosen, no quality loss is applied.